Amplifier and a method of power amplification

Details Amplifier and a method of power amplification Amplifier and a method of power amplification

1998-11-20

2000-12-19

Mottola, Steven J.

Amplifiers

Hum or noise or distortion bucking introduced into signal...

330151, H03F 126

Patent

active

061632139

ABSTRACT:
The present invention relates to a power amplifier (400) and to a method of amplifying in the power amplifier (400) a first composite radio signal (RF41) that includes at least two modulated carrier waves. The first radio signal (RF41) is divided into two radio signals (RF42, RF43), which are amplified in a first and a second non-linear amplifier (405, 406). Intermodulation products arise in the amplification of said radio signals in respective amplifiers (405, 406). A compensation signal (RF45) is generated from the output signal (RF46) of the second amplifier (406), and the modulated carrier waves are suppressed selectively, e.g. by filtering out the carrier waves in band-stop filters (408-409). An output signal (RF47) from the power amplifier (400) is generated by reverse phase addition of the compensation signal (RF45) to the output signal (RF44) from the first amplifier (405).

REFERENCES:
patent: 4879519 (1989-11-01), Myer
patent: 5619168 (1997-04-01), Myer
patent: 5850162 (1998-12-01), Danielsons
patent: 5917375 (1999-06-01), Lisco et al.

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